Added dirb

(cherry picked from commit 8c8514a147aa85ab384dbf81a22b74013f1241a3)

tools/dirb.md

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+# DirB
+
+Notes
+-------
+
+Help Text
+-------
+```
+-----------------
+DIRB v2.21    
+By The Dark Raver
+-----------------
+
+./dirb <url_base> [<wordlist_file(s)>] [options]
+
+========================= NOTES =========================
+ <url_base> : Base URL to scan. (Use -resume for session resuming)
+ <wordlist_file(s)> : List of wordfiles. (wordfile1,wordfile2,wordfile3...)
+
+======================== HOTKEYS ========================
+ 'n' -> Go to next directory.
+ 'q' -> Stop scan. (Saving state for resume)
+ 'r' -> Remaining scan stats.
+
+======================== OPTIONS ========================
+ -a <agent_string> : Specify your custom USER_AGENT.
+ -c <cookie_string> : Set a cookie for the HTTP request.
+ -f : Fine tunning of NOT_FOUND (404) detection.
+ -H <header_string> : Add a custom header to the HTTP request.
+ -i : Use case-insensitive search.
+ -l : Print "Location" header when found.
+ -N <nf_code>: Ignore responses with this HTTP code.
+ -o <output_file> : Save output to disk.
+ -p <proxy[:port]> : Use this proxy. (Default port is 1080)
+ -P <proxy_username:proxy_password> : Proxy Authentication.
+ -r : Don't search recursively.
+ -R : Interactive recursion. (Asks for each directory)
+ -S : Silent Mode. Don't show tested words. (For dumb terminals)
+ -t : Don't force an ending '/' on URLs.
+ -u <username:password> : HTTP Authentication.
+ -v : Show also NOT_FOUND pages.
+ -w : Don't stop on WARNING messages.
+ -X <extensions> / -x <exts_file> : Append each word with this extensions.
+ -z <milisecs> : Add a miliseconds delay to not cause excessive Flood.
+
+======================== EXAMPLES =======================
+ ./dirb http://url/directory/ (Simple Test)
+ ./dirb http://url/ -X .html (Test files with '.html' extension)
+ ./dirb http://url/ /usr/share/dirb/wordlists/vulns/apache.txt (Test with apache.txt wordlist)
+ ./dirb https://secure_url/ (Simple Test with SSL)
+
+```
+
+Example Usage
+-------
+
+Links
+-------
+